unable to grow grass - Knowledgebase Question

My back yard is full of weeds. I have sprayed and killed them off but they return. I planted grass seeds but they are over taken by the weeds. not only that the ground is very sandy. I have spread top soil but the sand over takes it especially when is stops raining. Please help

Sadly, you may have to start all over again. The condition and type of the soil under the grass is the most important element to the overall health of your lawn. It is a good idea to have the soil tested before establishing your new lawn. The soil test report will indicate the type and amount of fertilizer to apply for your lawn. This fertilizer (and lime, if required) should be worked into the top four to six inches of your soil. Use a vegetation killer (such as Round Up) to kill existing weeds. Once you've killed the weeds you?ll want to remove them, then rake and remove any other debris such as sticks and rocks. Then the soil should be tilled thoroughly, either by a mechanical tiller or digging down a spades depth over the entire area. The soil is now ready to be raked smooth, filling low spots and removing the humps and breaking up the larger clumps as you go. After you've prepared the soil, you can either broadcast seed or install sod. A thick, healthy lawn will shade and crowd out most weed seedlings so be sure to water and feed your new lawn on a regular basis. Enjoy your new lawn!